[ASTMatcher] Add handling for DeducedType to HasDeclarationMatcher

[ASTMatcher] Add handling for DeducedType to HasDeclarationMatcher

HasDeclarationMatcher did not handle DeducedType, it always returned false for deduced types.

So with code like this:
struct X{};
auto x = X{};

This did no longer match:
varDecl(hasType(recordDecl(hasName("X"))))

Because HasDeclarationMatcher didn't resolve the DeducedType of x.

Differential Revision: https://reviews.llvm.org/D36308

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@310095 91177308-0d34-0410-b5e6-96231b3b80d8